Wire · technology
GridStor closes US$220 million financing for 400MWh Arizona BESS
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Fusion42 · 23 September 2026 · Fusion42 review
GridStor has closed a US$220 million financing deal to develop the 400MWh White Tank battery energy storage system (BESS) project in Arizona, expected operational by early 2027 under a 20-year agreement with Arizona Public Service (APS). This project aims to enhance grid reliability amid record power demand in the state, supported by major financial partners such as ING Capital, KeyBank, and Zions Capital Markets.
This Wire brief sits within Fusion42's coverage of Clean Energy, and 2 sources have reported it between 23 Sep 2026 and 25 Sep 2026.
◆ ◆ The Wire takeaway
You need to see Arizona as open ground for grid-scale battery storage, with Arcadia’s White Tank project showing financing pathways and clear utility contracts. That puts battery developers and suppliers on notice that rapid deployment linked to record demand can unlock large, long-term utility deals.
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2 sources · first reported 23 Sep 2026 · latest 25 Sep 2026
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